Apparatus for the manufacture of artificial silk



De.; r,111, 192s. 1,695,094

N. B. GRILLET APPARATUS FR THE MANUCTURE 0F ATIFIGIAL SILK Filed sept. 24. y1925 G e 0 l` wf?) KVMDM @A 7 FLgi a ML a b mfp b 91 L fu f l l )Lgf/if gd if x v y l v CD1 b1 1 1 1` i C @2 |31 g a 91) d ezm] cVZI f' k bz 9a L l -.W

yPaten-ted Dec. 11,

UNITED STATES APATENT oFFlcE;

- mcoLAs BENOIT GRILLET, or NEUILLY, ERANcE, nssIefNoRTo SOCIETE PoUR LA FABRICATIGN DE LA SOIE RHODIASETA, 0F PARIS, FRANCE.

APPARATUS PoR THE. MANUEACTURE on ARTIFICIAL SILK.

Application mea septemteriafi, 1'926,seria1No. iszeazana-in France october 1, 1925.

In my U. S. Letters Patent No. 1,571,474, granted the 2nd Februar 1926, I have described methods permitti g to ensure, in a group of cells intended for dry spinning of artificial threads, the regularity of the heating of the gaseous atmosphere and the uniformity of the flow of the said atmosphere for all the cells of a grou of cells under consideration. By means o these methods, the regulation of the heating and of the gaseous flow lis performed practically automatically, each of these regulations in each case being simultaneous for all the cells employed inthe production of the same grade of silk.

v rlhe arrangement ldescribed in Patent No. 1,571,474, for obtaining the uniform regula-4 practically automatic method, the uniformv regulation of the heating inthe cells of a' v group or of several groups manufacturing the same product.- l l I n such a system, the heating elements'of a group are served by as many branch pipes as there are cells in the group, said branch pipes issuing yfrom an inflow collector, and these heating elements are .individually connected to an outlet collector.

. The inlet collectors of the groups are themselves branched on the main pipes which connect-them to the source ofheat. lThe out- -let collectors areconnected to the main pipes .for the exit ofthe fluid which, preferably,

goes againthrough the cycleafter being reheated.` o p y The diiculty met with in this typel of circulation is not so much that of maintaining a uniform temperature along the Whole length of the collectors feeding the individual heat by carefully lagging the pipes, by causinga communication with the sourcevof the ,heating fluid at both the extremities ofthe collector, or even at intermediate poi-nts, if nec- The real difficulty to surmount in order to obtain the regularity of the 'heating in the v case of ,a parallel circulation is that of obtaining a uniform flow of the heating fluid through the various individual elements.

According to this invention, the regularity of flow of the heating fluid through the individual elements is obtained by supplying` to the circulation of this iuid in the heating elements by the methods described lin Patent No.

1,571,474 for the circulation of the gaseous atmosphere in the cells.

If the heating fluid is supposed to flow un- 4der pressure in the system under consideration, itis first necessary that the pressure should be the same atA all the points Where an individual branch ypipe supplying one. element leaves one of the collectors belonging to the said System.4 For this', itis important that all the pipes conveying the fluid l'from the point Where pressure is applied to it to the indivdual'brancli pipes, that is, all the main v and secondary collectors, should be designed with a very large diameter, so as tofrender negligible thelosses of head along this dis-'- tance. The same precaution must be observed respecting' the dimensions of the secondary and main collectors receiving the Huid issuingfrom the individual elements.

.Ovving to these measures, if the connecting pipes and the individual heating elements are identical both in construction and in the manner in which they are disposed, the conditions of uniformity ofv flow in the individual eley ments will be much nearer obtainment. For

tion will correspond to each desired -rate of,

A 90 an installation of given dimensions, .a work# ing pressurein the system under considera-' sult would be differences in the absolute re-f sistance of the elements, and differences in;

the rate of lowlunder the same pressure. l

-would follow.

.In order to have every guarantee of uni? formity in the rates of 'flow of the heating fluid in spite ofy these possibilities, it will be necessary to maintain in the system a much 4higher pressure lthan that necessary for,` ensuring the required rate of ow,and to place on thev path ofthe tain elements from'sufferingaccidental modi- V vcations in the course of'vvorlrlng. The-reheatinguid a device cansing a substantial loss of head, such as a thin plate provided with a small hole of a predetermined diameter, a constriction of the piping of etc., which creates a notable loss of head, the influence of which is great with respect to the loss of head in the heating element itself and 'to the' losses ofhead in the piping system, *a given rate of flow corresponding to a glven pressure in an arrangement of given dimensions. h

All these devices creating a loss of head,

placed on the heating elements belonging tov the cells manufacturing a similar type of thread, are identical, and the rate of flow of the heating fluid will be caused to vary simultaneously in all th'ese elements by var'yhel above explanations relate to the case inwhich the motion of luidis caused by pressure, but the reasonin would be similar land the arrangements to e adopted would be the same if the movement of the fluid were caused by suction.

It is well Iunderstood that Vthe method Ittcording to the pesent invention is applicable whatever may the heating fluid employed,

4waterstea.r`n, any gas, etc., and whatever may be the type of heating element traversed (fin tube, c oil, jacket).

A single heating system .of the type de'- scribed may be contemplated for each spinning cell, or on the contrary,- several systems .ma `be use fed,for example, by fluids of di erent temperatures, and heating different zones of the cell, for example, on the one hand the re ion near' the -dies and lon the other hand t e region near the aperture through which the filaments issue.

The heating elements may heat either the cell itself, or any individual flow of atmoshere' intended for the cell, before itsintrouction into any desired region of the cell.

The' present invention is also applicable to the case when, instead of heating a .zone of the spinning cell,- it is, Aon the contrary, re-

- quired to cool it, the reasonings set forth above being evidently as suitable in'thi case as for heating.

In the appended drawings, Fig. 1 represents diagrammatically an arrangement in which the spinning cells a, a, al of a same lbntier are heated by hot water jackets b, b,

I .'he hot water arrives bythe main piping c in the branch pipings d feeding the individpredetermined 'length and diameter,`

ual cells', and in which are disposed the perforated. diaphragms e. The heating. water,

after percdlating through the jacket, leaves by the pipes f opening into the exhaustpipfig. 2 shows an arrangement in which each spinning cella is heated by two water jackets b, and b2 each of which 1s part of a system similar to that shown in Fig. l, so that the upper and the lower portions 'of the cell are heated at different temperatures, the upperf one b the arrangement c1, d1, el, b1, f1, 9 and t e lower one by the arrangement 0 dz, 82a bea fza-gz- L I As an example, lt'may be stated that, 1n a given apparatus, the pipin c had a diameter of 10 centimetres and tie loss of head between the two ends of the piping was found to be 2 millimetres of water, while the diaphragms e had orifices 2 millimetres in diameter causing ahead of 20 centimetres of water, hundred times greater than inthe main piping. In these conditions, the operation of the arrangement was found exactly as set forth. l What I claim anddesire to securey by Letters Patent is 1. In the manufacture of artificial threads by v-dry spinning, means for adjusting uniformly the temperature of the gaseous at-l mosphere in all the cells. by means of temperature-controlling elements connected in arallel and identical for all the cells, means ing provided for producing Aa fall of pres-y` sure, identical in each temperature-controlling'element, by devices, interchangeable but not individually adjustable, identical for all temperature-controlling elements, causing a substantial loss of head thereat, the said temperature-controlling elements of individual cells being 'connected in parallel' between main piping designed for a rate of flow of the temperaturescontrolling fluidgreatly in excess of that required, so as to render the loss of head in said pipings negligible.

2. In,the manufacture of artificial Vthreads a by dryspinning;,means for controllin the temperature of t e gaseous current in a the cells, as ,claimed in claim- 1, characterized inV that more than one temperature-controlling element is Lsed in each cell, the temperaturecontrolling Huid in said elements being at a different temperature, so as to obtain a dif-V ferent temperature in different portions of the cell. Y

3. A spinning ap aratus f or the manufacture. of artificial th comprising'l a plurality of spinning cells,

means to circulate a heating medium to heat said cells, and'means to control the temperature of each of said cells, said means causing a substantial loss of head. thereat and being connected in parallel between said heat-circulating means.

4. A spinning apparatus for the manufac reads by dry spinning .piping providing the circulation of a 'eating medium without any substantial loss of head therein, means for controlling the temperature of each of saidjcells, said means causing a substantial loss of headrthereatand being connected in parallel between said piping.

75. A spinning apparatus for the manufactre of artificial threads 'by dry spinning comprising a lurality of` spinning cells, means to circ ate a heating medium to heat said cells, a plurality of means to control the temperature ofeach cell at various portions thereof, said means causing a substantial loss of head thereat and connected in parallel between said heat-circulatin means.

' 6. A spinning apparatus -or the manufacture of artificial threads by dry spinning comprising a plurality of spinning cells, piping (providin thel circulation of a heatmg me 1 head therein, a plurality of meansto coni .trol the temperature of' each cell at various portions thereof, said means causing'a sub` n stantial loss of head thereat and connected in parallel between the said heat-circulating means.

In testimony whereof I have signed my name to this specification. v

NICOLAS BENOIT GRILLET.

um wit out any 'substantial loss of 

